CN104060572B - Flap type wave generator system in a kind of super gravity field - Google Patents
Flap type wave generator system in a kind of super gravity field Download PDFInfo
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Abstract
A flap type wave generator system in super gravity field, comprising: hydro-extractor system and wave making machine, and described wave making machine comprises motor, belt, variator, power conversion device, rocker device and the unrestrained device that disappears, and model casing is located in the hanging basket of hydro-extractor system; Wave making machine is located on model casing, and power conversion device is fixed on the upper surface of model casing top cover, motor, transmission shaft and variator be axially perpendicular to model casing top cover, motor and transmission shaft are set up in parallel; The output of motor exports the input end of power conversion device to through speed changer by transmission shaft; The rotary motion that motor exports is converted to straight reciprocating motion by power conversion device, then exports the first end of rocker to; Rocker device comprises rocker, fixed head and bearing, and bearing is fixed on model casing base plate, and the second end of rocker and fixed head are rotatably connected, and the first end of rocker and the output terminal of power conversion device are rotatably connected.The present invention is Mechanical Driven rocker-arm wave making machine, have control accuracy high, make the good advantage of ripple frequency characteristic.
Description
Technical field
The invention belongs to Geotechnical Centrifuge Model Test Technology field, relate to a kind of flap type wave generator system that can be used in centrifugal model test, be specifically designed to the simulation of super gravity field Wave load.
Background technology
Geotechnical centrifugal model test has been widely used in multiple field, solves the key technical problem of many complexity, particularly the statics interac-tion problem of soil and structure.But deep not enough for the research of the works under wave cycle load action and foundation dynamic interaction problem, only rest in the discussion of some mechanism.The dynamic interaction of foundation soil and structure under Wave Load will be studied in centrifugal model test, its technical bottleneck is simulation and the realization of wave under hypergravity effect, in the urgent need to researching and developing a set of wave making machine system that can use under high centrifugal acceleration condition.The research and development of this system, for distortion and the force-mechanism of exploring engineering works under the complex environment of ocean, promote the design and optimization of marine structure, and then promote that the development tool of China's ocean engineering technology is of great significance.
Simulation for super gravity field Wave load has some researchs, mainly comprises three kinds of methods: (1) quasi-static model.By wave ultimate load as a concentrated force, utilize static force loading device to put on works by this load, the wave load computing method of existing harbor work's specification recommends are exactly quasi-static model; (2) simulated waves force method.Namely adopt a certain device, simulated waves power (cyclic load) is applied to engineering structure.The process that charger applies power for engineering structure can be contact (as adopted hammering or applying mechanical force), also can be contactless (applying as adopted alternating electromagnetic force).(3) wave making epparatus applies.In centrifugal force field, utilize wave making epparatus to produce simulated waves, directly act on engineering works, this method is studied more in drum type hydro-extractor.With regard to current research, because the theory and analogue technique making ripple in centrifugal force field is also not too perfect, wave making epparatus also more complicated in centrifugal force field, therefore mostly mainly adopts two kinds of methods above about the research of wave load.Hydro-extractor wave making epparatus only realizes in indivedual small-sized arm-type hydro-extractor and drum type hydro-extractor, is only limitted to the research that some are mechanistic.
The exploitation dynamics to ocean is all being strengthened in countries in the world in recent years, in the urgent need to grasp complex condition " wave-ground-works mechanism of interaction, " for the design of Offshore Structures provides technical support.As the effective means uniquely reproducing prototype process under scaled model yardstick and true stress field condition, in corresponding super gravity field, wave making machine system is the forward position experimental provision realizing this purpose.
Therefore, the wave making machine system developed in a kind of super gravity field becomes very necessary to the ability simulating true wave load in super gravity field.
Summary of the invention
The object of the invention is to research and develop a set of wave making machine system with hypergravity effect Imitating true wave ability supporting with large geotechnical centrifuge, the simulation of wave-structure-foundation dynamic interaction is realized in centrifugal model test process, thus disclose the characteristics of motion of super gravity field Wave, for the distortion and mechanical characteristic studying marine structure provides research technique.
The invention provides the flap type wave generator system in a kind of super gravity field, this system can reflect all features of wave, comprise frequency, wavelength and the amplitude that can control wave, normally can work under centrifugal acceleration 120g condition, can simulate more than 60m depth condition, the length range of wave action is greater than 120m.
Owing to being in super gravity field environment, all analogue means all will bear huge centrifugal force.Wave making machine is the key equipment of super gravity field Wave Load Simulation, is faced with hypergravity condition and divides into the series of challenges such as received shipment kinetic force, running precision, Automated condtrol and testing tool microminiaturization.
The technical scheme realizing the object of the invention is: the flap type wave generator system in a kind of super gravity field, comprise: hydro-extractor system and wave making machine, described wave making machine comprises motor, belt, variator, power conversion device, rocker device and the unrestrained device that disappears, and described hydro-extractor system comprises pivoted arm, bearing, hanging basket and model casing; Described model casing is arranged in hanging basket; Described wave making machine is arranged on model casing, described motor, transmission shaft, variator, power conversion device are fixed on the upper surface of model casing top cover, motor, transmission shaft and variator be axially perpendicular to model casing top cover surface, motor and transmission shaft are set up in parallel, the first end of described transmission shaft is connected by belt with rotor, the bottom of transmission shaft is connected with variator, and the output of described motor exports the input end of power conversion device to through speed changer by transmission shaft; Described power conversion device comprises rotary disk, connecting rod, web member, sliding rail, and the rotary motion that motor exports is converted to straight reciprocating motion by described power conversion device, then exports the first end of rocker to; Described rocker device comprises rocker, fixed head and bearing, and bearing is fixed on model casing base plate, and the second end of rocker and fixed head are rotatably connected, and the first end of rocker is rotatably connected through the output terminal of model casing top cover and power conversion device; The described unrestrained device that disappears is vertically mounted on bottom model casing.
As a further improvement on the present invention, described power conversion device is made up of rotary disk, web member, connecting rod and sliding rail, rotary disk be provided with some with distance of center circle from the eccentric orfice do not waited, connecting rod is horizontally disposed with, one of them eccentric orfice on the first end of connecting rod and rotating disk is rotatably connected, and the second end of connecting rod is connected to the first end of rocker.
As a further improvement on the present invention, in described model casing, be also provided with the unrestrained device that disappears, described in the unrestrained device that disappears comprise wave eliminating board and holder, holder is connected on model casing base plate, and wave eliminating board is connected on holder.Described wave eliminating board adopts the unrestrained flase floor that disappears cracked, and in conjunction with plastic blind-ditch, and adopts and initiatively to disappear unrestrained technology, and formation no reflection events compound disappears unrestrained system.
The present invention has following advantages and good effect:
The present invention is Mechanical Driven rocker-arm wave making machine, utilizes precision electric motor as driving arrangement, have control accuracy high, make the good advantage of ripple frequency characteristic.Compared with other wave making machine, this wave making machine Operation system setting in super gravity field, can under Simulation of Complex condition wave to the effect of structure (constructing) thing.In addition, circular motion is transformed into the power conversion device of linearly bidirectional circulating motion, the rocker device of adjustable rocker height, the simulation of wave load of different frequency, amplitude can be realized.Wave making epparatus after building up will be arranged on 400gt large geotechnical centrifuge, normally can work, can simulate the 60m depth of water, all properties index Jun Ju first place in the world under 120g acceleration of gravity condition.
Accompanying drawing explanation
Fig. 1 flap type wave generator system architecture schematic diagram;
Fig. 2 is wave making machine sectional view;
Fig. 3 is wave making machine planimetric map;
In Fig. 1: 1-pivoted arm; 2-bearing; 3-hanging basket; 4-model casing, 4-1-rocker device, 4-2-disappears unrestrained device; 5-counterweight; 6-collector ring; 7-wave making machine; 8-main frame and Data Acquisition and Conversion System (DACS), 8-1-computing machine.
In Fig. 2, Fig. 3: 1-motor, 1-1-motor cabinet, 1-2-rotor; 2-belt; 3-transmission shaft, 3-1-transmission shaft first end, 3-2-transmission shaft second end; 4-variator; 5-rotary disk, 5-1-eccentric orfice; 6-web member, 6-1-ball bearing; 7-connecting rod, 7-1-connecting rod first end, 7-2-connecting rod second end; 8-sliding rail; 9-rocker device, 9-1-rocker bearing, 9-2 fixed head, 9-2-1-connection bearing, 9-3-rocker, 9-3-1-rocker first end, 9-3-2-rocker second end; 10-disappears unrestrained device, 10-1-holder, 10-2-wave eliminating board; 11-model casing, 11-1-model casing top cover, 11-2-model casing base plate.
Embodiment
In order to make object of the present invention, technical scheme and advantage clear, below in conjunction with accompanying drawing, the inventive method is described in further detail.
Embodiment 1
As shown in Figure 1, hydro-extractor system comprises: pivoted arm 1, bearing 2, hanging basket 3, model casing 4, counterweight 5, collector ring 6, wave making machine 7, main frame and Data Acquisition and Conversion System (DACS) 8.Model casing 4 is arranged in hanging basket 3, and wave making machine 7 is on model casing 4.
As shown in Figure 2,3, wave making machine 7 comprises motor 1 to wave making machine 7 in Fig. 1, belt 2, transmission shaft 3, variator 4, rotary disk 5, web member 6, connecting rod 7, sliding rail 8, rocker device 9, and disappear unrestrained device 10.
In Fig. 2,3, motor 1, variator 4, power conversion device are fixed on (comprising rotary disk 5, web member 6, connecting rod 7, sliding rail 8) upper surface of model casing top cover 11-1.Rocker device 9 is fixed on model casing 11 internal backplane 11-2 with the unrestrained device 10 that disappears.
In Fig. 2,3, power conversion device is by rotary disk 5, web member 6, and connecting rod 7 and sliding rail 8 form.The output shaft of motor 1 is connected to the rotary disk 5 of power conversion device through speed change 4 speed change by transmission shaft 3, the rotary motion of the output of motor 1 is converted to straight reciprocating motion by power conversion device, then exports the first end 9-3-1 of rocker to.Motor 1 is vertically mounted on motor cabinet 1-1, and motor cabinet 1-1 is fixed on model casing end face 11-1.The first end 3-1 of transmission shaft 3 is connected by belt 2 with rotor 1-2, and the bottom of transmission shaft 3 is connected with variator 4 and passes through variator 4 adjusting rotary speed.Be provided with rotary disk 5 at transmission shaft 3 second end 3-2, transmission shaft 3 second end 3-2 is connected with the central rigid of rotary disk 5.The different-diameter of rotary disk 5 is provided with eccentric orfice 5-1, and each eccentric orfice 5-1 is different from the distance in the center of circle, makes connecting rod 7 obtain multiple stroke.Like this, just can adjust the size of the radius of gyration, the stroke of control link 7, and then control the amplitude of oscillation of rocker 9-3.After designing a radius of gyration, on the eccentric orfice 5-1 of this radius of gyration, with web member 6, rotary disk 5 and connecting rod 7 are linked together, rotating disk is fixed a ball bearing 6-1, connecting rod is fixed a ball bearing 6-1, the center of circle of two ball bearing, on same pedal line, ensures that rotary disk 5 freely can rotate around web member 6, when ensureing that rotary disk 5 rotates, connecting rod 7 can freely swing in the horizontal plane simultaneously.
In Fig. 2,3, rocker device 9 comprises bearing 9-1, fixed head 9-2 and rocker 9-3 and forms, the first end 9-3-1 of rocker is arranged on sliding rail 8, be connected with the second end 7-2 of connecting rod 7 is rotatable, when motor 1 drives rotary disk 5 to rotate, connecting rod 7 does straight reciprocating motion on sliding rail 8; Connecting rod 7 is connected with rocker 9-3, and such rocker 9-3 can swing back and forth, and makes the water in model casing 11 produce wave.Second end 9-3-2 of rocker and fixed head 9-2 is rotatably connected, and fixed head 9-2 has the connection bearing 9-2-1 of differing heights can regulate the height of rocker 9-3.
The unrestrained device 10 that disappears in Fig. 2 is arranged in model casing 11, and the unrestrained device 10 that disappears comprises holder 10-1 and wave eliminating board 10-2, and holder 10-1 is connected on model casing base plate 11-2, and wave eliminating board 10-2 is connected on holder 10-1.Wave eliminating board 10-2 adopts the unrestrained flase floor that disappears cracked, and in conjunction with plastic blind-ditch, and adopts and initiatively to disappear unrestrained technology, and formation no reflection events compound disappears unrestrained system.
Motor 1 rotating speed is controlled, by the different strokes of the eccentric orfice control link 7 on rotary disk 5, the elevation by the different connection bearing 9-2-1 control rocker 9-3 on fixed head 9-2 by the main frame in Fig. 1 and Data Acquisition and Conversion System (DACS) 8, thus make rocker 9-3 have the different amplitudes of oscillation, rocker length and wobble frequency, and then can the frequency of controlling and adjustment wave, wavelength and wave amplitude.
Make unrestrained process of the test as follows:
1, prepare before test
1. analogue formation case: if model casing in Fig. 14 effective dimensions is that 1200mm(is long) * 400mm(is wide) * 800mm(is high), its intensity meets 120g test condition, in Fig. 1, model casing 4 casing is made primarily of high-strength aluminum alloy material, and to reach, severe is light, intensity is high, be out of shape little requirement.One side of model casing 4 adopts the poly (methyl methacrylate) plate of the high grade of transparency, and thickness of slab is not less than 120mm, is used for observing the variable condition of model in centrifugal test process;
2. foundation soil body, water body and structures are made: according to the size of the size of required ground foundation simulation soil, available depth and structures, in conjunction with model box size and the maximum centrifugal acceleration of hydro-extractor, determine suitable model scale N, thus determine the moulded dimension of foundation soil body, water body and structures, the manipulated soil with identical index that the soil body can adopt undisturbed soil or laboratory to obtain, the model of structures can select identical or similar materials making according to model size;
3. sensor is buried underground: bury corresponding sensor underground according to the physical quantity of required measurement.
2, wave making machine whole machine installation and debugging under 1g condition:
1. as Fig. 2, be vertically mounted on by motor on motor cabinet, motor cabinet is fixed in model casing top cover surface.Motor, by synchronous belt drive, ensures that the rotating speed on transmission shaft top is consistent with motor speed;
2. as Fig. 2, variator is arranged on the bottom of transmission shaft, can be changed the rotating speed of transmission shaft by variator, reaches accurately and the object of stability contorting rotary disk velocity of rotation;
3. as Fig. 2, install rotary disk in transmission shaft lower end, the eccentric orfice on rotary disk different-diameter can form the different radiuses of gyration, makes connecting rod have different strokes, thus controls the amplitude of oscillation of rocker; Connecting rod is connected with rocker top, and rocker top is arranged on sliding rail, and when transmission shaft drives turntable rotation, connecting rod second end does straight reciprocating motion on horizontal guide rail, thus forms power conversion device;
4. as Fig. 2, wave making machine rocker upper end is arranged on sliding rail by slide block, and is connected with the connecting rod in power conversion device by bearing.Lower end is connected with a fixed head by bearing, fixed head is equipped with connection bearing along the multiple position of short transverse, can regulates the length of rocker.Such rocker swings back and forth around bearing, makes the water in model casing produce wave;
5. as Fig. 2, the unrestrained device that disappears is vertically mounted on bottom model casing;
6. as Fig. 1, connect data acquisition system (DAS), various survey sensor is connected into front end units, ensure that bitcom can carry out data collection and analysis.
3, wave making machine performance adjustment in super gravity field:
As Fig. 1, wave making machine is arranged on 400gt large geotechnical centrifuge, carries out the system test under hypergravity condition.First apply less centrifugal acceleration during test, after wave making machine working stability, progressively increase centrifugal acceleration again, until 120g, detect performance and the working condition of each device in super gravity field.
4, wave making machine test in super gravity field:
Determine each correlation parameter according to guide N, carry out the ripple of making of wave making machine in super gravity field and test.
Claims (4)
1. the flap type wave generator system in a super gravity field, comprise: hydro-extractor system and wave making machine, described wave making machine comprises motor, belt, variator, power conversion device, rocker device and the unrestrained device that disappears, and it is characterized in that, described hydro-extractor system comprises pivoted arm, bearing, hanging basket and model casing; Described model casing is arranged in hanging basket; Described wave making machine is arranged on model casing, described motor, transmission shaft, variator, power conversion device are fixed on the upper surface of model casing top cover, motor, transmission shaft and variator be axially perpendicular to model casing top cover surface, motor and transmission shaft are set up in parallel, the first end of described transmission shaft is connected by belt with rotor, the bottom of transmission shaft is connected with variator, and the output of described motor exports the input end of power conversion device to through speed changer by transmission shaft; The rotary motion that motor exports is converted to straight reciprocating motion by described power conversion device, then exports the first end of rocker to; Described rocker device comprises rocker, fixed head and bearing, and bearing is fixed on model casing base plate, and the second end of rocker and fixed head are rotatably connected, and the first end of rocker is rotatably connected through the output terminal of model casing top cover and power conversion device; On the base plate that the described unrestrained device that disappears is located in model casing.
2. flap type wave generator system according to claim 1, it is characterized in that, described power conversion device is made up of rotary disk, web member, connecting rod and sliding rail, rotary disk be provided with some with distance of center circle from the eccentric orfice do not waited, connecting rod is horizontally disposed with, and the first end of connecting rod is rotatably connected by one of them eccentric orfice on web member and rotary disk; Described sliding rail is located at the upper surface at model casing top cover, and the first end of rocker is arranged on sliding rail by slide block, and the second end of connecting rod is connected to the first end of rocker.
3. flap type wave generator system according to claim 1, is characterized in that, described model casing casing is made up of high-strength aluminum alloy material, and model casing one side adopts transparent poly (methyl methacrylate) plate.
4. flap type wave generator system according to claim 1, is characterized in that, described in the unrestrained device that disappears comprise wave eliminating board and holder, holder is connected on model casing base plate, and wave eliminating board is connected on holder.
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| CN109141819B (en) * | 2018-09-26 | 2023-10-03 | 中国工程物理研究院总体工程研究所 | Wave simulation generating device under supergravity field |
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| CN109827748A (en) * | 2019-03-14 | 2019-05-31 | 交通运输部天津水运工程科学研究所 | A kind of wave maker in geotechnical centrifuge |
| CN110579333B (en) * | 2019-08-13 | 2021-07-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Supergravity field ship traveling wave simulation test device and method |
| CN110646165B (en) * | 2019-10-21 | 2021-04-09 | 上海海事大学 | Push-swing combined wave generating device and wave generating method thereof |
| CN113267322B (en) * | 2021-06-03 | 2023-05-02 | 上海市东方海事工程技术有限公司 | Continuously adjustable internal wave generating device |
| CN115112349B (en) * | 2022-08-29 | 2023-03-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Load decoupling device and ocean storm-flow centrifugal model test system |
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